Results 151 to 160 of about 1,079 (210)

Ethanol dehydrogenation to ethyl acetate by using copper and copper chromite catalysts

Chemical Engineering Journal, 2012
Abstract In the recent years, the interest in the ethanol production from renewable natural sources, as a possible alternative energy vector, has strongly grown in the world. The low-cost ethanol availability has also favored the study of the production of different chemicals such as ethylene, ethyl ether, acetaldehyde and ethyl acetate starting from
E Santacesaria, G Carotenuto, Riccardo Tesser   +2 more
exaly   +4 more sources

Reversible adsorption of thiophene on copper chromite

Journal of Chemical Technology and Biotechnology. Chemical Technology, 1983
AbstractAdsorption isotherms of thiophene on copper chromite catalyst have been obtained under catalytic conditions using the gas chromatographic technique. The isotherms were found to follow the Freundlich adsorption equation. The isosteric heat of adsorption has been determined from the isotherms and found to be dependent on surface coverage.
S. D. Sansare, V. R. Choudhary, L. K. Doraiswamy   +2 more
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Mechanistic features of reduction of copper chromite and state of absorbed hydrogen in the structure of reduced copper chromite

Russian Journal of General Chemistry, 2008
The review discusses the experimental data on the unusual mechanism of the reduction of copper cations from the copper chromite, CuCr2O4, structure. Treatment of copper chromite in hydrogen at 180–370°C is not accompanied by water formation but leads to absorption of hydrogen by the oxide structure with simultaneous formation of metallic copper as ...
L M Plyasova, Yu A Chesalov, V I Zaikovskii   +2 more
exaly   +2 more sources

Synthesis of copper chromite catalyst

Aerospace Science and Technology, 2004
Abstract Copper chromite (CuCr 2 O 4 ) catalysts were prepared by ceramic and coprecipitation methods and characterized by X-ray diffraction, scanning electron microscopy (SEM), elemental, differential calorimetric (DSC), thermogravimetric and granulometric analysis, mass spectroscopy and infrared spectroscopy (IR).
Aparecida M Kawamoto
exaly   +2 more sources

Novel microwave synthesis of copper chromite nanoparticles

Inorganic Chemistry Communication, 2021
Abstract Here, a novel microwave synthesis method has been used to prepare copper chromite nanoparticles. Effect of capping agents viz; citric acid, oleic acid, coconut oil, and urea on crystal structure and size of copper chromite nanoparticles (CuCr2O4 NPs) are presented.
Pawan K Khanna
exaly   +2 more sources

Methane combustion over copper chromite catalysts

Catalysis Letters, 1997
A study of the activity and durability of two different copper chromite catalysts in methane combustion is presented. The catalysts, a massive (CAT-E) and a supported (CAT-I) copper chromite, were characterized by different techniques in order to investigate morphological properties (N2 adsorption), crystalline structure (X-ray diffraction, XRD) and ...
G. Comino, A. Gervasini, V. Ragaini, Z. Ismagilov   +3 more
openaire   +2 more sources

Structure and reactivity of copper-zinc-cadmium chromite catalysts

Applied Catalysis A: General, 1995
Abstract Different mixed oxides containing Cu, Zn, Cd and Cr were obtained by heating hydroxycarbonate precursors at various temperatures and in different atmospheres, and characterized by using X-ray diffraction (XRD), infrared, diffuse reflectance spectroscopy, thermogravimetry, and BET and copper surface area analysis.
CASTIGLIONI GL, VACCARI A, FIERRO G, INVERSI M, LO JACONO M, MINELLI M, PETTITI I, PORTA P, GAZZANO M   +8 more
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Moderate-temperature reduction of copper chromite by hydrogen and hydrogen desorption from the surface of reduced chromite

Kinetics and Catalysis, 2000
The reduction of copper chromite CuCr2O4 by hydrogen at 300–573 K and a hydrogen pressure of 4×104-8 × 104 104 Pa and hydrogen desorption from the surface of a reduced sample are studied. The rate of copper chromite reduction becomes high at temperatures above 473 K.
I I Simentsova, Khasin A V
exaly   +2 more sources

Deactivation mechanistic studies of copper chromite catalyst for selective hydrogenation of 2-furfuraldehyde

Journal of Catalysis, 2013
Deactivation mechanisms of copper chromite (CuCr2O4 center dot CuO) catalyst for vapor-phase selective hydrogenation for furfuryl alcohol have been investigated using ex situ and in situ X-ray absorption fine structure (XAFS), X-ray photon spectroscopy ...
Dongxia Liu, Dmitry Zemlyanov, Tianpin Wu   +2 more
exaly   +2 more sources

Studies on the copper chromite catalystIII. Increase in the activity of the copper chromite catalyst by the water-gas reaction

Journal of Catalysis, 1966
The copper chromite catalyst is used in the reduction of fatty esters into higher alcohols. In this reaction the copper chromite catalyst, CuO/CuCr2O4 * , is reduced to Cu/Cr2O3 * by hydrogen. In this reduction a part of the water formed is adsorbed onto the catalyst and gives Cu/Cr2O3. (H2O)ad.
B MIYA, F HOSHINO, I IWASA
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